Question detail
For Amounts of substances in equations (HT only), which option best supports this Unit 4.3 objective: (HT only) Change the subject of equations used in reacting-mass calculations. (MS 3b)?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
- A. To ensure accurate calculations of reactants and products
- B. To make the equations easier to read
- C. To eliminate unnecessary variables
- D. To convert units of measurement
Answer
The correct option is To ensure accurate calculations of reactants and products.
Explanation
The correct option is To ensure accurate calculations of reactants and products. To ensure accurate calculations of reactants and products is correct because it directly supports the approved learning objective to (HT only) Change the subject of equations used in reacting-mass calculations. (MS 3b). The reasoning belongs to Amounts of substances in equations (HT only) within Use of amount of substance in relation to masses of pure substances, so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term HT only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3. The other options are weaker because they either use the wrong formula, the wrong unit, a vague relationship, or the wrong quantitative context.
Common mistake
Changing the Subject of Equations
Students often forget to correctly rearrange the equation when changing the subject, leading to incorrect calculations.
Practice rearranging equations step-by-step, ensuring each term is correctly isolated on one side of the equation.
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